Não informado. (1982). National Water Conditions. U.S. Department of the Interior, Geological Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. National Water Conditions. Reston, Va: U.S. Department of the Interior, Geological Survey, 1982.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. National Water Conditions. U.S. Department of the Interior, Geological Survey, 1982.
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